The white 26° Lens Tube from ETC is an interchangeable accessory for Source Four Mini lighting fixtures. When mounted to a Source Four Mini light, this optical attachment outputs a 26° field angle, equal to 13.7 ft field diameter at 30 ft. A metal frame in front of the lens accommodates 2.75" (70mm) gel color media, and the frame is equipped with a tool-free retaining clip that locks to the lens tube.